Usb-firmware-tool-alcor-au6366-au6371.epub [WORKING]

USB‑Firmware‑Tool for Alcor AU6366/AU6371: Architecture, Functionality, and Security Implications

| Offset | Size | Meaning | |--------|------|---------| | 0x00 | 4 | Magic ( 0x41554346 = “AUCF”) | | 0x04 | 4 | Image size (LE) | | 0x08 | 4 | Target flash offset | | 0x0C | 4 | CRC32 of payload | Usb-firmware-tool-alcor-au6366-au6371.epub

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If the header is omitted, the tool treats the entire file as the payload and calculates the CRC on the fly. | Test Scenario | Command | Result | Remarks | |---------------|---------|--------|---------| | Read Flash (full) | alcor-fwtool read --addr 0x0000 --size 0x40000 output.bin | Success, 256 KB dump matches vendor tool’s dump. | CRC validated. | | Write Valid Firmware | alcor-fwtool write new_firmware.bin | Device rebooted into new firmware; UART ports re‑configured as expected. | Flash erase + write completed in 3.2 s. | | Partial Update | alcor-fwtool write --offset 0x2000 patch.bin | Only targeted pages updated; other regions untouched. | Useful for incremental patches. | | Invalid CRC | alcor-fwtool write corrupted.bin | Tool aborts with “CRC mismatch” error before any write. | Prevents accidental bricking. | | Bootloader Entry | alcor-fwtool reset --bootloader | Device re‑enumerates with PID 0x05dd (bootloader mode). | Enables headless updates. | | Unsupported Device | alcor-fwtool info on a non‑Alcor USB‑UART | “Device not recognized” exit code 2. | Safe failure mode. | | | Write Valid Firmware | alcor-fwtool write new_firmware